Valveless pump



2 Sheets-Sheet 1 P. VOREAUX VALVELESS PUMP Filed March 192- Oct.18,1927.

Oct. 18,1927. P VOREAUX f 1,645,834

VALVELE-SS PUMP Filed March 11. 51924 2 Sheets-$119M 2 t... s. 1s, 921.

-UNITED STATES I 1,645,834 PATENT OFFICE.

PAUL VOBIAUX, OF PARIS, FRANCE, ASSIGNOB TO E'IAIBLISSEMENTS SAMGA ETBAVOX REUNIS, 0] PARIS, FRANCE.

VALVELESS PUMP.

Application fled latch 11, 1824, Serial No. 888,479,.and in France July13, 1828.

The present invention has for its object a ump adapted to revolve at agreat speed ich has the minimum of wei ht, occulies as little space aspossible an is easily grivenby the modern-style high rate motors. Thecharacteristic feature of this pump consists in the way in which thepistons are connected with the crank-shaft by means of ivot-bearingsallowing the piston to effect, liesidestheir reciprocating motion, arevolving motion about themselves around their axis, so that thepiston'will execute a resulting helical or tacking motion withlnnts clinder, which motion is used for securing lie delivery and the normalsucking and forcing or exhausting operation of the pump.

The following description made with reference to the accompanyingdrawing, given by way of example, will allow to easily understand theway in which the invention is carried out.

' Fig. 1 is a 'lon 'tudinal section of the pump made throng X-X of Fig.2.

Fig. 2 is a section made through YY of Fig. 1.

Fig. 3 is a detail view of a piston.

Fig. 4 is a sectional view through Z-'Z of Fig. 3.

Fig. 5 is a plan view of Fig. 4.

Fig. 6 is a modified form of Fig. 3.

Fig. 7 is a front view of the pivot-bearin A I Fig. 8 is a section throh V-V of Fig. 7. 9 is a horizonta section through U- of Fig. 8. A

The apparatus essentially comprises a fixed frame 0i formed by two cyindrical map barrels which are arranged crosswise, at the one withreference to-the other, and acting as support for the crank-shaft b withtwo elbows whose axis is normal to those of the pump barrels.

In the barrel a are provided ports or' orifices c and d for theadmission and exhaust of air. Pistons e which are rigidly connectedtogether two by two, are mounted on the crank-shaft through the mediumof pivot-bearings f, shown in Figs. 7, 8 and 9. Phese bearings can beformed of two parts and compr se an internal cylindrical cavity f intowhich one of the cylindrical bearings of the crank-shaft b is adapted toenter as shown in Fig. 1. On the other hand, the ends f, acting aspivots, freely enter into cylindrical recesses g, see Fig.

' pump barrel.

4, which are arranged parallel but eccentric to the axis H of the pistonc. It will be noted that I use 'no connecting rods between pistons andcranks, the pivot pins being all that is required. Bottoms or heads Gclose the pump barrel and secure tightness.

Accordingly, it will be understood that a revolution ofthe crank-shaft bwill impart to a group of two diametrally opposed pistons a. tacking orhelical motion, which means that every piston, while having areciprocating motion within its cylinder, will rotate about its own axism-w.

The motion of each of the crank-pins may be considered as resolved intotwo components, one parallel to the axis of the pistons it actuates, andthe other at right angles to it. The first of these motions communicatedto the pistons through members 7 f? will reciprocate the pistons, whilethe second motionat right angles to the axis and at a distance from itoscillates thepistons. As the member f oscillates with the piston itslides back and forth on the crank pin, the

' crank pin being made longer than the member f to provide for thismotion. -This helical motion is utilized for insuring, on

the one hand, the volumetric variation causing the suction and theexhaust and,' on the other hand, the delivery. To this purpose, everypiston is provided with two opposite holes h, i which are adapted tosucessively uncover the ports a d, of the Referring to Figs: 1 and 2, itwill be seen that the up r iston e is at the end of its up stroke.v n orthese conditions, its orifice It will uncover, at the down stroke of theiston e, the port a in movin in the direction of the arrow shown in p 1lines at Fig. 2. On the contrary, the port a will move away from theport (1, whereas, in virtue or the revolution of the iston about itsaxis :v-w, the said port 11 wil come to the position which is indicatedin mixed lines at z, the port or hole 'h being above the port 0; thismoment. will correspond to the full suction.

When the piston has achieved its suction stroke and is at the end of itsdown stroke,

of the piston, that is to sa the piston, in rising again, will revolveabout its axis in, the opposite direction to that in which it has beenrevolving during the down motion and consequently it is the port i whichcomes opposite the exhaust or forcing port d, thereby allowing the aircontained between the piston and the head of the cylinder to escapethrough the said exhaust pipe (1 as shown in Fig. 1.

It will be understood that the degree of compression of the pump can bevaried according to the position and the form of the ports or orificesc, d, h, i. More particularly, it is possible touse ports or .ori ficeshavin an oval or flattened action, as shown in ig. 6.

In the construction which is shown in Figs. 1 and 2, the pump sucks andforces without compressing that is to say that the forcing or exhaustingports 0 n as soon as the suction ports are close The pump which is thusconstructed forms a compact mas, which is well balanced, has lightmoving members and a reduced number of parts,

tors. I v g Of course, some modifications can be made in theconstruction of the pump which has just been described without departingfrom the principle of the invention.

What I ciaim is:

In a pump a casing having two opposite cylinders and pistons, a crankshaft mounted in the casing, means forming a sole connection between thecrank of sald shaft and eccentrically with the opposed ends of thepistons, each of said means having slid' movement longitudinally of thecrank, an said casing and pistons having cooperating ports.

In testimony that I claim the foregoing as my invention, I have signedmy name hereto.

PAUL VOBEAUX.

the pistons acting by themselves as distribu;

